Nice and quick article. It's kind of clear that the problem is not coding. It's fun and creative.

For me it's clear that most challenging thing is managing egos, not naming variables. Egos decide procesess and rules with insufficient data. Some egos even like to decide with insufficient data and twist the measurements later to conform their views.

So: Self ego, managers egos, shareholders egos, and the infinite edges between these entities.

It's certainly harder than rust and monads :D